Document Detail

Controlled aggregation in conjugated polymer nanoparticles via organic acid treatments.
MedLine Citation:
PMID:  21808426     Owner:  NLM     Status:  Publisher    
Understanding and controlling aggregation structures of conjugated polymers (CPs) in aqueous solutions is critical to improving the physical and photophysical properties of CPs for biological applications. Here, we present spectroscopic evidence, including nuclear magnetic resonance (NMR) spectroscopic results, that different organic acid treatment induces different aggregation structures and photophysical properties of CPs in water. Conjugated polymer nanoparticles (CPNs) were fabricated by treating a non-aqueous soluble, primary amine-containing poly(phenylene ethynylene) (PPE-NH(2)) with organic acids followed by dialysis. CPNs formed by acetic acid (AA) treatment (CPN-AAs) exhibit characteristics of loose aggregation with minimal π-π stacking, while CPNs formed by tartaric acid (TA) treatment (CPN-TAs) exhibit a high degree of π-π stacking among PPE-NH(2) chains. The controlled aggregation for a specific application was demonstrated by comparing the fluorescence quenching abilities of the CPN-AAs and the CPN-TAs. A doubled Stern-Volmer constant was obtained from the densely packed CPN-TAs compared to that of the loosely aggregated CPN-AAs.
Yoon-Joo Ko; Eladio Mendez; Joong Ho Moon
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Publication Detail:
Journal Detail:
Title:  Macromolecules     Volume:  44     ISSN:  0024-9297     ISO Abbreviation:  -     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-8-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0365316     Medline TA:  Macromolecules     Country:  -    
Other Details:
Languages:  ENG     Pagination:  5527-5530     Citation Subset:  -    
Department of Chemistry and Biochemistry, Florida International University, 11200 SW 8 St., Miami, FL 33199, USA.
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MeSH Terms
Grant Support
R25 GM061347-01//NIGMS NIH HHS

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